Matdoan, Muhammad Yahya, and Wahyu Irianto. 2022. “Analysis of Online Learning During the Covid-19 Period Using the Ordinary Least Square (OLS) Method”. Pattimura International Journal of Mathematics (PIJMath) 1 (1), 17-26. https://doi.org/10.30598/pijmathvol1iss1pp17-26.